package com.lottery.im.util;

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Build;
import android.os.Environment;
import android.os.Looper;
import android.widget.Toast;

import com.lottery.im.MyApplication;
import com.lottery.im.R;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.Thread.UncaughtExceptionHandler;
import java.lang.reflect.Field;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

/**
 * UncaughtException处理类,当程序发生Uncaught异常的时候,有该类来接管程序,并记录发送错误报告.
 * 需要在Application中注册，为了要在程序启动器就监控整个程序。
 */
public class CrashHandler implements UncaughtExceptionHandler {
  public static final String TAG = "CrashHandler";
  //系统默认的UncaughtException处理类
  private UncaughtExceptionHandler mDefaultHandler;
  //CrashHandler实例
  private static CrashHandler instance;
  //程序的Context对象
  private static Context mContext;
  //用来存储设备信息和异常信息
  private static Map<String, String> info = new HashMap<>();
  //用于格式化日期,作为日志文件名的一部分
  private static DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");

  /**
   * 保证只有一个CrashHandler实例
   */
  private CrashHandler() {
  }

  /**
   * 获取CrashHandler实例 ,单例模式
   */
  public static CrashHandler getInstance() {
    if (instance == null) {
      instance = new CrashHandler();
    }
    return instance;
  }

  /**
   * 初始化
   */
  public void init(Context context) {
    mContext = context;
    //获取系统默认的UncaughtException处理器
    mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
    //设置该CrashHandler为程序的默认处理器
    Thread.setDefaultUncaughtExceptionHandler(this);
  }

  /**
   * 当UncaughtException发生时会转入该函数来处理
   */
  @Override
  public void uncaughtException(Thread thread, Throwable ex) {
    if (!handleException(ex) && mDefaultHandler != null) {
      //如果用户没有处理则让系统默认的异常处理器来处理
      mDefaultHandler.uncaughtException(thread, ex);
    } else {
      try {
        Thread.sleep(3000);
      } catch (InterruptedException e) {
      }
      //退出程序
      android.os.Process.killProcess(android.os.Process.myPid());
      System.exit(1);
    }
  }

  /**
   * 自定义错误处理,收集错误信息 发送错误报告等操作均在此完成.
   *
   * @return true:如果处理了该异常信息;否则返回false.
   */
  private boolean handleException(Throwable ex) {
    if (ex == null) {
      return false;
    }
    //收集设备参数信息
    collectDeviceInfo(mContext);
    //使用Toast来显示异常信息
    new Thread() {
      @Override
      public void run() {
        Looper.prepare();
        Toast.makeText(mContext, R.string.error_message, Toast.LENGTH_SHORT).show();
        Looper.loop();
      }
    }.start();
    //保存日志文件
    saveCatchInfo2File(ex);
    return true;
  }

  /**
   * 收集设备参数信息
   */
  public void collectDeviceInfo(Context ctx) {
    try {
      PackageManager pm = ctx.getPackageManager();
      PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(), PackageManager.GET_ACTIVITIES);
      if (pi != null) {
        String versionName = pi.versionName == null ? "null" : pi.versionName;
        String versionCode = pi.versionCode + "";
        info.put("versionName", versionName);
        info.put("versionCode", versionCode);
      }
    } catch (NameNotFoundException e) {
    }
    Field[] fields = Build.class.getDeclaredFields();
    for (Field field : fields) {
      try {
        field.setAccessible(true);
        info.put(field.getName(), field.get(null).toString());
      } catch (Exception e) {
      }
    }
  }

  private static String getFilePath() {
    String file_dir = "";
    // SD卡是否存在
    boolean isSDCardExist = Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState());
    // Environment.getExternalStorageDirectory()相当于File file=new File("/sdcard")
    boolean isRootDirExist = Environment.getExternalStorageDirectory().exists();
    if (isSDCardExist && isRootDirExist) {
      file_dir = Environment.getExternalStorageDirectory().getAbsolutePath()
          + "/com.HongFu.FlagLottery/crash_log/";
    } else {
      // MyApplication.getInstance().getFilesDir()返回的路劲为/data/data/PACKAGE_NAME/files，其中的包就是我们建立的主Activity所在的包
      file_dir = MyApplication.getInstance().getFilesDir().getAbsolutePath()
          + "/com.HongFu.FlagLottery/crash_log/";
    }
    return file_dir;
  }

  /**
   * 保存错误信息到文件中
   *
   * @return 返回文件名称, 便于将文件传送到服务器
   */
  public static String saveCatchInfo2File(Throwable ex) {
    StringBuffer sb = new StringBuffer();
    for (Map.Entry<String, String> entry : info.entrySet()) {
      String key = entry.getKey();
      String value = entry.getValue();
      sb.append(key + "=" + value + "\n");
    }
    Writer writer = new StringWriter();
    PrintWriter printWriter = new PrintWriter(writer);
    ex.printStackTrace(printWriter);
    Throwable cause = ex.getCause();
    while (cause != null) {
      cause.printStackTrace(printWriter);
      cause = cause.getCause();
    }
    printWriter.close();
    String result = writer.toString();
    sb.append(result);
    try {
      long timestamp = System.currentTimeMillis();
      String time = formatter.format(new Date());
      String fileName = "crash-" + time + "-" + timestamp + ".log";
      String file_dir = getFilePath();
      //			if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
      File dir = new File(file_dir);
      if (!dir.exists()) {
        dir.mkdirs();
      }
      File file = new File(file_dir + fileName);
      if (!file.exists()) {
        file.createNewFile();
      }
      FileOutputStream fos = new FileOutputStream(file);
      fos.write(sb.toString().getBytes());
      //发送给开发人员
      sendCrashLog2PM(file_dir + fileName);
      fos.close();
      //			}
      return fileName;
    } catch (Exception e) {
    }
    return null;
  }

  /**
   * 将捕获的导致崩溃的错误信息发送给开发人员
   * 目前只将log日志保存在sdcard 和输出到LogCat中，并未发送给后台。
   */
  private static void sendCrashLog2PM(String fileName) {
    if (!new File(fileName).exists()) {
      Toast.makeText(mContext, "日志文件不存在！", Toast.LENGTH_SHORT).show();
      return;
    }
    FileInputStream fis = null;
    BufferedReader reader = null;
    String s = null;
    try {
      fis = new FileInputStream(fileName);
      reader = new BufferedReader(new InputStreamReader(fis, "GBK"));
      while (true) {
        s = reader.readLine();
        if (s == null) {
          break;
        }
        //由于目前尚未确定以何种方式发送，所以先打出log日志。
      }
    } catch (FileNotFoundException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    } finally { // 关闭流
      try {
        reader.close();
        fis.close();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
  }
}